"Vesa Helanti" wrote in message
...


Snip
Piston has an arrow on top, which has quite definitely previously been
pointed to the exhaust port.

Vesa Helanti

Most, if not all "small" 2 strokers with an arrow on the piston top
will need the arrow to point toward the flywheel end of the crankshaft.

BTW, I lived in Tokyo in 1962-1963 and worked with a Tohatsu factory
rider, I was invited to visit the Tohatsu R&D lab and saw a 125cc 2 stroke
turn 27K RPM and produce 47HP on a dyno , in 63 that was an unheard of
output

Aubrey in big D
96 Virago 535
78 Suzuki GS750E